HURRICANE KATRINA DISCUSSION NUMBER 15
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
11 PM EDT FRI AUG 26 2005

THE SATELLITE PRESENTATION HAS CONTINUED TO IMPROVE AND CONSISTS OF
A PERFECT A COMMA-SHAPED CLOUD PATTERN WHICH BEGINS OVER WESTERN
CUBA AND WRAPS AROUND A LARGE CLUSTER OF VERY DEEP CONVECTION. THIS
BAND IS PROBABLY PRODUCING NEAR TROPICAL STORM FORCE WINDS ALONG
THE NORTH COAST OF WESTERN CUBA. ALTHOUGH THE EYE IS NOT CLEARLY
VISIBLE ON IR IMAGES...RADAR DATA INDICATE THAT THE EYE IS EMBEDDED
WITHIN THIS CIRCULAR AREA OF DEEP CONVECTION. T-NUMBERS FROM SAB
AND TAFB HAVE INCREASED TO 5.0 ON THE DVORAK SCALE. THEREFORE...
THE INITIAL INTENSITY HAS BEEN ADJUSTED TO 90 KNOTS. AN AIR FORCE
RECONNAISSANCE PLANE IS SCHEDULED TO BE IN KATRINA IN THE NEXT FEW
HOURS. THE HURRICANE IS EXPECTED TO BE UNDER A TYPICAL 200 MB
ANTICYLONE...WITH A CYCLONIC CIRCULATION EXTENDING UPWARD TO THAT
LEVEL. THIS IS THE TYPICAL PATTERN OBSERVED IN INTENSE HURRICANES.
IN ADDITION...KATRINA IS FORECAST TO MOVE DIRECTLY OVER THE WARM
LOOP CURRENT OF THE GULF OF MEXICO...WHICH IS LIKE ADDING HIGH
OCTANE FUEL TO THE FIRE. THEREFORE...THE OFFICIAL FORECAST BRINGS
KATRINA TO 115 KNOTS...OR A CATEGORY FOUR ON THE SAFFIR-SIMPSON
HURRICANE SCALE. THE GFDL IS MORE AGGRESSIVE AND CALLS FOR 124
KNOTS AND 922 MB. THE FSU SUPERENSEMBLE IS EVEN MORE AGGRESSIVE
BRINGING KATRINA TO 131 KNOTS.